Radio Frequency Module Filters and Terminal Spacing for Reception Sensitivity
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Solution Overview
Problem
Simultaneous communication in multiple communication bands can cause interference between transmission and reception signals, leading to a decrease in reception sensitivity.
Innovation Solution
A radio frequency module with a specific arrangement of filters and terminals on a rectangular module substrate, including a first filter connected between a radio frequency input terminal and an antenna connection terminal for TDD communication, and a second filter connected between a radio frequency output terminal and the antenna connection terminal for simultaneous communication, with terminals positioned along the sides of the substrate to increase distance and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If simultaneous communication is performed in multiple communication bands, then communication capability is improved, but reception sensitivity deteriorates due to interference between transmission and reception signals
Solution Approach 1:
The patent segments the module substrate into distinct regions for transmission terminals and reception terminals, placing them in opposite corners to minimize signal interference while maintaining simultaneous multi-band communication capability
Solution Approach 2:
The patent utilizes the two-dimensional surface of the module substrate to strategically position terminals in different spatial locations (opposite corners), effectively using spatial separation to reduce interference between transmission and reception signals
2Area of stationary object
If transmission terminal and reception terminal are placed close together, then device size is reduced, but signal interference increases
Solution Approach 1:
The patent employs asymmetric positioning of terminals on the module substrate, placing transmission and reception terminals in opposite corners rather than symmetric arrangements, which maximizes the distance between them while maintaining a compact overall module size
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses interference between transmission and reception signals, improving reception sensitivity during simultaneous communication in multiple bands.
Implementation Method 1
a first filter arranged on the first main surface, connected between the radio frequency input terminal/the first radio frequency output terminal and the antenna connection terminal, and having a passband including a first communication band for time division duplex (TDD); and a second filter arranged on the first main surface, connected between the second radio frequency output terminal and the antenna connection terminal, and having a passband including at least part of a second communication band allowed for simultaneous communication with the first communication band
Data Source
AI summary
A radio frequency module includes: a radio frequency input terminal for receiving an amplified transmission signal from the outside; radio frequency output terminals for supplying a reception signal to the outside; a filter connected between the radio frequency input terminal/the radio frequency output terminal and an antenna connection terminal, and having a passband including communication band D for TDD; and a filter connected between the radio frequency output terminal and the antenna connection terminal and having a passband including at least part of communication band A allowed for simultaneous communication with communication band D. The radio frequency input terminal is arranged in a region extending along a side of the module substrate, and the radio frequency output terminal is arranged in a region extending along a side facing the side of the module substrate.